Piperazino-acetylamino-9-fluorenones and-anthraquinones

ABSTRACT

1-((4-Methyl-1-piperazinyl)-acetylamino)-9-fluorenones andanthraquinones optionally substituted in the 4-position by chlorine, bromine, hydroxy or nitro have antipyretic activity. They are generally prepared by reaction of a 1-( Alpha haloacetylamino)-9-fluorenone or-anthraquinone with Nmethylpiperazine.

United States Patent Otto Hromatka Vienna XIX;

Maximilian Knollmuller, Vienna Ill; Kurt A. Maier, Vienna XIX, all of Austria 810,344

Mar. 25, 1969 Nov. 23, 1971 Smith Kline & French Laboratories Philadelphia, Pa.

[ 72] Inventors [21 Appl. No. 22 Filed [45] Patented [73] Assignee [S4] PIPERAZINO-ACETYLAMINO-9-FLUORENONES AND-ANTHRAQUINONES 7 Claims, No Drawings [52] [1.8. CI 260/268, 260/376, 260/381, 260/544, 260/562, 260/578, 424/250 [51] lnt.Cl C07d 51/70 50 Field of Search 260/268 TR [56] References Cited UNITED STATES PATENTS 2,585,555 2/1952 Jeimy et a1 260/268 3,294,803 12/1966 Rosi 260/268 X 3,418,064 12/1968 Buechler 260/268 X 3,519,642 7/1970 Wedemeyer et al. 260/268 X Primary ExaminerDonald G. Daus Attorneys-William H. Edgerton, Richard D. Foggio, Joan S.

Keps, Alan D. Lourie and Joseph A. Marlino AN'I'I'IRAQUINONES lhisinvention'relates to novel substituted l-acety 9- macodynamic activity. More specifically the compounds of foregoing is a general description .of howto prepare the compounds of this invention. The; following examples illus nine the preparation of aspecific compounds having anfluorenones and-anthraquinones which have useful pharthis invention have antipyretic activity a demonstrated in standard laboratory animals. For example the temperature of fevered rats is decreased upon oral administration of doses of l-200 mgJkg.

The l-acetylamino-9-fluorenones and-anthraquinones of this invention are represented by the following general structural formula:

Formula I wherein:

A represents a single valence bond or a carbonyl group; and

R1 represents hydrogen, chlorine, bromine, hydroxy or nitro, preferably hydrogen, chlorine or bromine. 1

The compounds of this invention may be used 'n the form of a phannaceutically acceptable acid addition salt having the utility of the free base. Such salts, prepared by methods well known to the art, are formed with both inorganic or organic acids, for example: maleic, fumaric, benzoic, ascorbic, pamoic, succinic, bismethylenesalicyclic, methanesulfonic, esthanedisulfonic acetic, propionic, tartaric, salicyclic, citric, gluconic, lactic, malic, mandelic, cinnamic, citraconic, aspartic, stearic, palmitic, itaconic, glycolic, p-aminobe'nzoic, glutamic, benzenesulfonic, hydrochloric, hydrobromic, sulfuric, sulfamic, phosphoric and nitric acids.

The compounds of formula I are prepared according to the following synthetic method:

wherein A and R are as defined above and X is chlorine or bromine. Thus the i-amino-Q-fluorenohe or laminoanthraquinone is reacted with an a-haloacetyl halide to yield the l-(a-haloacetylamino) derivative. The latter is treated with n-methylpiperazine to give the product. Alternatively, when an a-chloroacetylamino intermediate is emplayed, the chlorine can be exchanged with iodine by reaction with sodium iodide in acetone to give the more reactive oziodoacetylamino derivative which is similarly reacted as above to give the product. 7

The compounds of this invention may be administered orally or parenterally in conventional dosage unit forms such as tablets, capsules, injectables or the like, by incorporatingl phase remains alkaline. The benzene solution is washed, dried and evaporated to yield lchloroacetylamino-9-fluorenone,

tipyretic activity. However this. should not'be construedv as limiting the'scope of the. invention sinceappropriate variations products set forth in formula I.

PREPARATIONS A. l-Chloroacetylamino-Sl-fluorenone A solution of 12.5 g. of l-amino-9 -'fl'uorenone in'500 ml. of v benzene is mixed with a solution (if-l7. g. of chloroacetylchloride in 50 ml. of benzene. The suspension formed is mixed and shaken with 2N potassium hydroxide until theaqueous m.p. l63l 65 C. B. 4-Bromo l -chloroacetylamino-9-fluorenone 4-Bromo-l-amino-9-fluorenone (7.72 g. is dissolved in 400 ml. of boiling benzene, 20 g. of potassium carbonate is added and a solution of 5.65 g. of. chloroacetyl chloride in 50ml. of benzene is added dropwise over 20 minutes. The mixture is heated under reflux for} U2 hours, filtered hot and then cooled to give 4-bromo-l-chIoroacetyl-amino-9-fluorenone,

m.p. l90-l92C. g C. l-lodoacetylamino-9-fluorenone a mixture of 12.9 g. of l-chloroacetylamino 9-fluorenon and l0.0 g. of sodium iodide in 700 ml. of dry acetone is refluxed for 7 hours, filtered hot and concentrated to give I- iodoacetylamino-9-fluorenone, m.p. l65-l66 C.

Similarly, 4-bromo-l-iodoacetylamino-9-fluorenone prepared m.p. l80.5-l82 C. D. l-lodoacetylaminoanthraquinones A l-chloroacetylaminoanthraquinone is extracted via a Soxhlet extractor into a solution of sodium iodide in dry acetone to give the corresponding iododerivative. Reaction conditions and melting points of ll. -substituted iodoacetylaminoanthraquinones are as follows:

Chloro Sodium 7 Length of Melting Iodide Acetone Extraction Point.

(3-) (ml). (hrs) CL 15.5 12.0 300 s roe-n1 no,

no so sso is 139-101 2.5 2.0 270 s sol-2|:

A solution of 2.8 g. of N-methylpiperazine in 50 ml. of ab solute benzene is added dropwise over l 112 hours to a solution of 5.08 g. of l-iodoacetylamino-9-fluorenone in 250 ml. of absolute benzene. The mixture is refluxed for 2 hours, t'tltered and shaken with water. Extraction with dilute hydrochloric acid followed by basifying the acid extract with alkali and further extraction with ether/chloroform yields upon evaporation the dried organic extract l-[(4-methyl-lpiperazinyl)-acetylamino]-9#fluorenone, m.p. tor-165C.

' am le:

A solution of 1.5 of N-methylpiperazine in 50 ml. of ab,-

' solute toluene is added dropwise over 2 H2 hours to a solution the appropriate dose of a compound of fonnula l, or an appharmaceutical practices.

of 3.0 g. of 4-bromo-l-iodoacetylamino-9-iluorenone in 200 ml. of absolute toluene. The hot solution is filtered, cooled and extracted with 0.5 N hydrochloric acid solution. The acid extract is neutralized with sodium carbonate and made alkaline with 30 percent sodium hydroxide solution. By extraction with ether/chlorofonn there is obtained 4-bromo-l-[(4- methyl-l-piperazinyl)-acetylamino]-9-fluorenone, m.p. I88- EXAMPLE 3 benzene, then made alkaline. The alkaline extract is extracted 7 with benzene and the benzene solution is dried and evaporated to give 1-](4-methyl-l-piperazinyl)-acetylamino]- anthraquinone, m.p. l94-l96 C.

EXAMPLE 4 A mixture of 5 .0 g. of 4-chlorol iodoacetylaminoanthraquinone and 4.0 g. of N-methylpiperazine in 250 ml. of toluene is refluxed for 2 hours. cooled and filtered. The filtrate is extracted with dilute hydrochloric acid and the acid extract is made alkaline. The precipitate is washed with water, then alcohol to yield 4-chloro-l-](4-lpiperazinyl)-acetylamino]-anthraquinone, m.p. 228-299 C. Dec.

Similarly, reaction with 4-hydroxy-l-iodoacetylaminoanthraquinone yields the corresponding 4-hydroxy-l-]-(4- methyl- 1 -piperazinyl)-acetylamino]-anthraquinone.

EXAMPLE 5 4-nitroanthraquinone, m.p. 206-208 C.

What is claimed is:

l. A chemical compound or a pharmaceutically acceptable acidaddition salt thereof, said compoundhaying the following formula:

0 NHCOCHg-N N-CH;

in which:

A is a single valence bond or a carbonyl group;

and

R1 is hydrogen, chlorine, bromine, hydroxy, or nitro.

2. A chemical compound according to claim 1 in which A is a single valence bond.

3. A chemical compound according to claim 2 in which Rl is hydrogen.

4. A chemical compound according to claim 2 in which Rl is bromine 5. A chemical compound according to claim 1 in which A is a carbonyl group. l

6. A chemical compound according to claim 5 in which Rl is hydrogen.

7. A chemical compound according to claim 5 in which RI is chlorine. 

2. A chemical compound according to claim 1 in which A is a single valence bond.
 3. A chemical compound according to claim 2 in which R1 is hydrogen.
 4. A chemical compound according to claim 2 in which R1 is bromine.
 5. A chemical compound according to claim 1 in which A is a carbonyl group.
 6. A chemical compound according to claim 5 in which R1 is hydrogen.
 7. A chemical compound according to claim 5 in which R1 is chlorine. 